Ive a question, its question37 and 19 in oct/nov 08, and i cant understand them.
Could anyone help me?
37.this is a property of a thermistor:AS TEMP ACROSS THERMISTOR INCREASES THE RESISTANCE DECREASES. so in the question, it says, temp across thermistor increases, so resistance decreases, and when resistance decreases, more current can flow towards the lamp (current and resistance are inversely proportional) , and therefore it gets brighter. ANSWER IS C.
19.hot air always rises and cold air moves down, so the gap is down, so from the heater the hot air goes up and cold air goes down.
GET IT!!!!